\begin{tabular}{@{\extracolsep{2pt}}lD{.}{.}{-1}D{.}{.}{-1}D{.}{.}{-1}} \\[-1.8ex]\toprule \\[-1.8ex] & \multicolumn{1}{ >{\centering\arraybackslash}m{2cm} }{Control} & \multicolumn{1}{ >{\centering\arraybackslash}m{2cm} }{Treatment} & \multicolumn{1}{ >{\centering\arraybackslash}m{2cm} }{All}  \\ \\[-1.8ex] \hline \\[-1.8ex]
No Imputation&\multicolumn{1}{c}{6.67}&\multicolumn{1}{c}{6.52}&\multicolumn{1}{c}{6.58}\\
&\multicolumn{1}{c}{[1336]}&\multicolumn{1}{c}{[1899]}&\multicolumn{1}{c}{[3235]}\\
Rule A: Stack-Experiment&\multicolumn{1}{c}{6.80}&\multicolumn{1}{c}{6.54}&\multicolumn{1}{c}{6.66}\\
&\multicolumn{1}{c}{[1768]}&\multicolumn{1}{c}{[2028]}&\multicolumn{1}{c}{[3796]}\\
Rule B: Treatment-Month&\multicolumn{1}{c}{6.88}&\multicolumn{1}{c}{6.59}&\multicolumn{1}{c}{6.72}\\
&\multicolumn{1}{c}{[1768]}&\multicolumn{1}{c}{[2028]}&\multicolumn{1}{c}{[3796]}\\
\bottomrule \\[-1.8ex]\end{tabular}
